content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.basetypes;
  
  import org.reactivestreams.Subscriber;
  
  import io.reactivex.rxjava3.exceptions.Exceptions;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.internal.subscriptions.EmptySubscription;
  
  /**
   * Executes an Action and terminates.
   *
   * @param <T> the value type
   */
  final class PerhapsFromAction<T> extends Perhaps<T> implements Supplier<T> {
  
      final Action action;
  
      PerhapsFromAction(Action action) {
          this.action = action;
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super T> s) {
          s.onSubscribe(EmptySubscription.INSTANCE);
  
          try {
              get();
          } catch (Throwable ex) {
              Exceptions.throwIfFatal(ex);
              s.onError(ex);
              return;
          }
  
          s.onComplete();
      }
  
      @Override
      public T get() throws Throwable {
          action.run();
          return null;
      }
  }
  